等壁厚塑料异型材挤出口模设计的修正

Revisal Pattern for Design of Equal-wall Thickness Plastics Profile Extrusion Dies

提出了塑料异型材挤出口模设计分等壁厚和非等壁厚异型挤出口模的设计方法。建立了等壁厚异型材挤出口模设计修正的物理模型和数学模型 ,计算出交汇熔料流速和分布及其流量 ,根据离模平均速度和平均流量相等 ,对交汇区截面形状进行了修正 ,该修正的口模模型在应用中与塑料异型材挤出成型较为符合。

s Design methods for equal and different wall thickness plastics profile extrusion dies were proposed,and new revisal physics and mathematics patterns for equal-wall thickness plastics profile extrusion dies were set up in this paper.The speed and variation and rate of melt flow in the intersect area were calculated on the principle of addition speed.The equality principle of average speed and rate of the melt flow in the intersect area and h×h area were advanced and the intersect area shape was revised.The revisal patterns tally with the actual situation of plastics profile extrusion molding.